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5.8. Defueling Control Valve (134AF). The defueling control valve (Figure 5.6)
is a diaphragm-
actuated solenoid shutoff valve. This valve and the defueling pump energize simultaneously. When the
valve is energized, it opens to permit defueling through the system.
Figure 5.6. Defueling Control Valve (134AF).
5.9. Dual Rate-of-Flow Control Valve (41AF).
5.9.1. The dual rate-of-flow control valve (Figure 5.7) is a combination rate-of-flow control valve
and fast-closing, hydraulically operated check valve that closes the main valve against reverse flow.
It performs two distinct functions: maintaining a preset flow rate of 757 liters per minute (200 gallons
per minute); and acting as a check valve to prevent reverse flow.
5.9.2. Pressure Setting. Set the valve to maintain a flow rate of 757 liters per minute (200 gallons per
minute) according to manufacturer's guidelines.